Mechanical pencil



W. D. MEASEI 2,455,596 y MECHANICAL PENCIL Dec. 7, 1948.

3 Sheets-Sheet l Filed Maron 2a, 1945 TI .1* FDE- INVENTOR.

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Dwz. 7, Mlm, W. D. MEASE MECHANICAL RENCIL 5 Sheets-Sheet 2 Filed March28|, 1945 mf-M 5 mm W. um WLM mw. W M 0L W @ggg wlmi (u i ,Di-3C. 7,W.'| 3 MEASE MECHANICAL PENCIL 3 Sheets-Sheet 3 Filed March 28, 1945 flw'EIC-LH Patented Dec.` 7,

l. 1 H `This"invention` concerns "a newy and improved type oflrnechanicalmarking pencil.` While its features, can be, and are,`iritended` for incorpora--` tiortin all types ofpencils, it isespecially adapt ed"`fo`r `use ichinaniarking with leads from size .046"in diameter 11:0...162'5 and larger. In inventing4 this pencil threemajor points were in 'mindi` Theyare' as-follow'st f l. To construct apencil thatwcan` be loaded without the necessity f" disassembly of anypart of'thevpencil. 1.` s 'i l 2. To construct a pencil that wouldtakethe maximum length ,of leadper loading,

3. To construct a" tip assembly that would permitthe loading of theIpenil throughtthetip 5. fwithout scoring or breakingthe lead. t

the pencil Fig. 7 is a longitudinal elevation of the inner barrel of thepencil, detached.

Fig. 8 is a plan of the outer barrel.

Fig. 9 is a sectional elevation of the outer barrel. i

Fig. 10 is an elevation, partly in section of the end cap, detached.

Fig. 11 is a plan of the same.

Fig. 12 is a sectional elevation of the tip member of the pencil,detached. i

Fig. 13 is a longitudinal elevation of a modified form of inner barrel.

Fig. 14 is a longitudinal elevation of a modined outer barrel tocooperate with the inner barrel of Fig. 13.

Fig. 15 is a cross section in line I5I5 of Fig. 14.

Fig. 16 is a sectional elevation of a modified tip member andlead-gripping sleeve therein.

Fig. 17 `is a. cross section on line I'I-I1 of Fig. 16.

Fig. 18 is a sectional elevation of the tip showing the manner in whichthe sleeve may be inserted or removed.

Referring particularly at present to the form shown in Figs. 1 to 12,the pencil comprises an ,MECHANIQALPENCI i WilburlD. Vlvlease, Berkeley,Calif; :I .Application Marianas, 1945, serial No. 585,231' i w14 claims.(ci. 12o- 18) inner open ended barrel I ""liaving ja e of cient` size tofreely receive` a" lengtlfrof` lead f2, The barrel-ends arejthreadedasshown ,t1 l3, the lower end foi` thefbarrel, `below the @adjacentthreads; being formedwitha `short taper 4L ning nearly the fulllengthyofthe barrel Between thethreadedportions 3 `is asloti in which ridesuap'inl` attached to a leadadvagricingf plungei'in barrel'I. 1 l "i,

The pin 6 projects outwardly ofthe barrel and into `ahelical groove yIlcut in the boreofithe outer barrel S from endto end thereof; i i" *j Thebarrel Slis turnably,ttedfonibarrelIad is held from` `longitudinalmovement"therebnbyfa ca`p` III` threaded onto the,` upperend of`barrel'll and a tubular `tip member II Jthreadediontothe lower end ofbarrel I. i

As shown particularly in Figs. 6` and 12, the bore I2 of the tip, belowthe threaded portion, is as large for the initial portion of its lengthas the bore of barrel I. The remaining portion I3 of said bore issmaller and longer, being somewhat greater in size than the lead 2. Asleeve I4 of thin spring metal, split from end to end and tending tocontract, projects through bore I3 into bore I2, terminating in thelatter in a flared lip I5 adapted to cooperate with taper 4 of barrel I,said taper 4 projecting into bore I2. Down- Wardly flaring fins IE onthe sleeve I4 in opposed relation to lip I5, are adapted to cooperatewith a ilare I'I depending outwardly from the rim of bore I3,whichprojects into bore I2 somewhat" as shown. Lip I5 and fins IB arespaced apart relative to ilares 4 and I1 so that the sleeve I4 may havea certain amount of lengthwise movement and may be free of actualcontact with flares or shoulders 4 and II when the lead is gripped bythe sleeve.

In operation, it will be obvious that the plunger 'I 'will be advanced.advancing the lead, upon rotation of outer barrel =9 relative to innerbarrel I.

As the advancing pressure is placed on the lead, the sleeve I4 which isgripping the lead is shifted lengthwise until fins I6 engage flaringshoulder I'I.

This engagement spreads or expands the sleeve, releasing the lead sothat it slides freely and without scoring. As soon as the advancingpressure on the lead ceases, the sleeve I4 again grips the lead. Writingpressure on the lead does not shift the sleeve, since the inner end ofthe lead bears against the plunger 'I.

When inserting a lead into the barrel I, the initial pressure .of thelead against the sleeve I4 as said lead is pressed against the outer endof the same in entering relation, shifts the sleeve 'so that flare I5engages shoulder 4, again spreading or expanding the sleeve' andallowing the lead to enter and slide into place without resistance.

In the form of the pencil shown in Figs. 13

to 18, tl'ie lead feeding structure is reversed; the l outer barrel I8having a longitudinal groove I9 to engage the pin 20 onvthe leadadvancing plunger 2| in the inner barrel 22; the latter having a helicalgroove 23 cut therethru.

not project-into the"lead-fitting'fborefZS of'the tip 26, but terminatesin a. flare 21 at its outer end which cooperates with the aringshoulderr z 28 on the inner end of the bore 25. Theiunctioning of thissleeve however, when al lead is 15 being inserted or advanced, isoliv-ionen#,fV the;s same as in the first describedtyn.

I claim:

1. A mechanical pencil comprising al' leach-re-u v, ceiving barrel, atip on the barrel from the outer 20 endtofiwhiclr`the.leadpreiterata:for ivvritina',r means inf the barrel.tonadvance.tifa lead".througli the tipi:m'l'eadmzipping.membminrthefitin saiclmem herscomprisingv,alongitudinalitz-sp1itspring sleeve tm contract Aand..,normallyHgripping 1-,lie 25 ofithelbanrekptha-distance between theilare eleE 35mmtslonithevsleevef heingilessT than that. Vbetween the shoulders. y, n

3. A mechanical pencil comprising a lead-receiving barrel, a tip on thebarrel from the outer end of which the lead projects for writing, meansin the barrel to advance the lead through the tip, a longitudinallysplit spring sleeve mounted for limited longitudinal movement in saidtip and normally contracted in lead-gripping position, and cooperatingmeans on the sleeve and the tip to cause said sleeve to expand and re-Ieaseftheleadwhen theiseeveihasimhui a predennmedmosiciun wnmmthe tipia1 4. A mechanical pencil comprising a lead-receiving barrel, a tip onthe barrelfrom the outer .endloftwhich the lead projects for writing,means in the Abarrel to advance the lead through the tipi;azlongibndinally split spring sleeve mounted for limited longitudinalmovement in said tip and ncnnallyrcontracted in lead-gripping position,an,.-inclined face on the interior of said tip, a flared element on saidsplit sleeve, said element adapted-to engage, andrideuponsaid inclinedface .when said :sleeveis'moveda predetermined distance towardjthe outerend of "said" tipftoex pandjsaid sleeve to.lead-releasingposition;y vWILBUl-fDi:MlElllSEl'j r l 'ltEiERENCES""CIIED*` The followingreferencestfare of record imthe nie of this patent: i

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